Five 10" cubes in sight and within 180" of the necromancer are chosen. In the instant Den Siva's Falcata is cast, dozens of elderday necromantic powered single-edged blades concave near the base and convex near the point, pitch from above impaling targets in each of the cubes.   Each creature makes a dexterity savings throw. On failure the creature takes 5d6 + proficiency bonus in necrotic damage, and 5d6 + proficiency bonus in magical piercing damage. At the start of the target's turn it must make another savings throw or have its constitution reduced by the proficiency bonus and take a additional proficiency bonus worth of necrotic damage and proficiency bonus worth of magical piercing damage.   On a successful save, the target takes half damage and suffers no other effect.